Hp difference? No, 650cc is 650cc.

*may* be a slight difference in idle quality as de-capped injectors have a coarse spray pattern....I wouldn't know as my motor has 272 cams in it so the idle is always going to be a little lopey.

On a side note: I pulled my de-caps out and went for 800's to run E85.

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

I think it is great to be able to make a diy mod and achieve a performance gain.